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lim(x to 1) (x^4+4x^3-5x^2)/(x-1)...

`lim_(x to 1) (x^4+4x^3-5x^2)/(x-1)`

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`lim_(x to 1) (x^4+4x^3-5x^2)/(x-1)`
=`lim_(x to 1) (x^2(x^2+4x-5))/(x-1)`
=`lim_(x to 1) (x^2(x+5)(x-1))/(x-1) = lim_(x to 1) x^2(x+5x)`
=`(1)^2(1+5) = 6` Ans.
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